Search Publications
SN 2013ai: A Link between Hydrogen-rich and Hydrogen-poor Core-collapse Supernovae
Lyman, J. D.; Kirshner, R. P.; Suntzeff, N. B. +33 more
We present a study of the optical and near-infrared (NIR) spectra of SN 2013ai along with its light curves. These data range from discovery until 380 days after explosion. SN 2013ai is a fast declining Type II supernova (SN II) with an unusually long rise time, 18.9 ± 2.7 days in the V-band, and a bright V-band peak absolute magnitude of -18.7 ± 0…
Multiepoch Optical Images of IRC+10216 Tell about the Central Star and the Adjacent Environment
Ohyama, Youichi; Ueta, Toshiya; Lee, Ho-Gyu +5 more
Six images of IRC+10216 taken by the Hubble Space Telescope at three epochs in 2001, 2011, and 2016 are compared in the rest frame of the central carbon star. An accurate astrometry has been achieved with the help of Gaia Data Release 2. The positions of the carbon star in the individual epochs are determined using its known proper motion, definin…
Can the Fe K-alpha Line Reliably Predict Supernova Remnant Progenitors?
Frank, Kari A.; Burrows, David N.; Dwarkadas, Vikram V. +1 more
The centroid energy of the Fe Kα line has been used to identify the progenitors of supernova remnants (SNRs). These investigations generally considered the energy of the centroid derived from the spectrum of the entire remnant. Here we use XMM-Newton data to investigate the Fe Kα centroid in 6 SNRs: 3C 397, N132D, W49B, DEM L71, 1E 0102.2-7219, an…
The GOGREEN Survey: Evidence of an Excess of Quiescent Disks in Clusters at 1.0
Cooper, M. C.; Muzzin, Adam; Forrest, Ben +21 more
We present the results of the measured shapes of 832 galaxies in 11 galaxy clusters at 1.0 < z < 1.4 from the GOGREEN survey. We measure the axis ratio (q), the ratio of the minor to the major axis, of the cluster galaxies from near-infrared Hubble Space Telescope imaging using Sérsic profile fitting and compare them with a field sample. We …
Measuring Stellar Masses of Emission-line Galaxies at 1.2 < z < 1.9
Yang, Guang; Gronwall, Caryl; Ciardullo, Robin +4 more
The accurate measurement of stellar masses over a wide range of galaxy properties is essential for better constraining models of galaxy evolution. Emission-line galaxies (ELGs) tend to have better redshift estimates than continuum-selected objects, and have been shown to span a large range of physical properties, including stellar mass. Using data…
AGN Triality of Triple Mergers: Multiwavelength Classifications
Gültekin, Kayhan; Runnoe, Jessie C.; Foord, Adi +1 more
We present results from a multiwavelength analysis searching for multiple active galactic nucleus (AGN) systems in nearby (z < 0.077) triple galaxy mergers. Combining archival Chandra, Sloan Digital Data Survey (SDSS), Wide-field Infrared Survey Explorer (WISE), and Very Large Array observations, we quantify the rate of nearby triple AGNs, as w…
Fine Structures of an EUV Wave Event from Multi-viewpoint Observations
Moon, Yong-Jae; Chen, P. F.; Schmieder, Brigitte +4 more
In this study, we investigate an extreme ultraviolet (EUV) wave event on 2010 February 11, which occurred as a limb event from the Earth viewpoint and a disk event from the Solar Terrestrial Relations Observatory-Behind viewpoint. We use the data obtained by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory in various EUV ch…
Searching for Dwarf Galaxies in Gaia DR2 Phase-space Data Using Wavelet Transforms
Darragh-Ford, Elise; Wechsler, Risa H.; Nadler, Ethan O. +1 more
We present a wavelet-based algorithm to identify dwarf galaxies in the Milky Way in Gaia DR2 data. Our algorithm detects overdensities in 4D position-proper-motion space, making it the first search to explicitly use velocity information to search for dwarf galaxy candidates. We optimize our algorithm and quantify its performance by searching for m…
Shock Properties and Associated Characteristics of Solar Energetic Particles in the 2017 September 10 Ground-level Enhancement Event
Jin, Meng; Liu, Ying D.; Xu, Xiaojun +3 more
The solar eruption on 2017 September 10 was accompanied by a fast coronal mass ejection (~3000 km s-1) and produced a ground-level enhancement (GLE) event at Earth. Multiple-viewpoint remote sensing observations are used to find the three-dimensional (3D) structure of the shock. We determine the shock parameters by combining the 3D shoc…
Local Active Galactic Nuclei with Large Broad-Hα Variability Reside in Red Galaxies
Wang, Jing; Liu, Wen-Juan; Yao, Su +4 more
Inspired by our serendipitous discovery of six active galactic nuclei (AGNs) with varying broad-Hα fluxes over years from our search for intermediate-mass black holes (IMBHs), we conduct a systematic investigation of changing-look (CL) and large-variability AGNs. We collect all the CL AGNs at z < 0.15 and the reverberation-mapped AGNs with stro…